Montezuma, Colorado has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from -6.1 °C (low) to 8.3 °C (high). Annual precipitation averages 561.8 Millimeters. Montezuma is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Jun. 21 - Jun. 30 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -15.2 °C | -2.4 °C | 42.42 mm |
| February | -14.6 °C | -1.2 °C | 44.96 mm |
| March | -11.5 °C | 3 °C | 52.32 mm |
| April | -8.2 °C | 6.3 °C | 67.56 mm |
| May | -3.2 °C | 11.4 °C | 52.07 mm |
| June | 1.2 °C | 17.6 °C | 32.77 mm |
| July | 4.5 °C | 20.8 °C | 57.4 mm |
| August | 3.6 °C | 19.4 °C | 54.61 mm |
| September | 0.6 °C | 15.9 °C | 39.88 mm |
| October | -4.9 °C | 9.2 °C | 37.08 mm |
| November | -10.6 °C | 2.4 °C | 40.64 mm |
| December | -14.9 °C | -2.4 °C | 40.13 mm |
| Annual | -6.1 °C | 8.3 °C | 561.84 mm |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 21 - Jun. 30 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |